I'm having keyboard issues on my nexus 4. If my phone locks with the keyboard on screen, then when I unlock, the qwerty keyboard shows over the pad to enter my code. I can work around by clicking the emergency call, then using the back arrow to get the lock screen and number pad. It's super frustrating. It also stays on if I am typing and swipe notifications down. The problem just began, and persists even I change the keyboard. Would love some help!
I have a moto x and I have a problem where my keyboard gets stuck on the screen and can't be closed too. I have a friend with another phone who has the same issue. I am guessing it is a new bug that was introduced by an update to the Google Keyboard app, since mine had been working fine for more than a year and I have had no OS upgrades on my phone.
I too have been looking for an answer on this and as of yet I am not sure that Google is even aware that the problem exists.
After a little more digging, I may have come to an answer. I did notice that my problems started after I added the handwriting recognition functionality to my phone. I found one forum that suggests that turning it off will fix the issue. I shut mine off and will use it that way to see if it helps. I suggest you try that too.
To shut it off go to settings -> Language & Input, then uncheck the Google Handwriting input.
Hope this helps :-)